/etc/apache2/sites-available/qwik.example.com

<IfModule mod_proxy.c>
#turning ProxyRequests on and allowing proxying from all may allow
#spammers to use your proxy to send email.
ProxyRequests Off
<Proxy *>
Order deny,allow
# Deny from all
Allow from all
#Allow from .your_domain.com
</Proxy>